Pith Number

pith:DUWWDRKD

pith:2021:DUWWDRKD6WCNYZV35WAYZD72PE

not attested not anchored not stored refs pending

Varstrometry for Off-nucleus and Dual sub-Kpc AGN (VODKA): Hubble Space Telescope Discovers Double Quasars

Hsiang-Chih Hwang, Jennifer I. Li, Nadia L. Zakamska, Qian Yang, Xin Liu, Yu-Ching Chen, Yue Shen

arxiv:2108.01672 v2 · 2021-08-03 · astro-ph.HE · astro-ph.GA

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DUWWDRKD6WCNYZV35WAYZD72PE}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-05T03:53:48.728621Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1d2d61c543f584dc66bbed818c8ffa7920a83a8b77907d1cb7b7f37908606ade

Aliases

arxiv: 2108.01672 · arxiv_version: 2108.01672v2 · doi: 10.48550/arxiv.2108.01672 · pith_short_12: DUWWDRKD6WCN · pith_short_16: DUWWDRKD6WCNYZV3 · pith_short_8: DUWWDRKD

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/DUWWDRKD6WCNYZV35WAYZD72PE \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 1d2d61c543f584dc66bbed818c8ffa7920a83a8b77907d1cb7b7f37908606ade

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "74e495ee002f9e612441fa53021ae2552349f67fa5b0ce314db3eb08f48c1526",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2021-08-03T18:00:00Z",
    "title_canon_sha256": "677ab9680bb3adb5ba28708d89f606cd08288a3dca58ae5706e0b2956e8ea739"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2108.01672",
    "kind": "arxiv",
    "version": 2
  }
}